---
id: Category
name: Category
version: 1.0.0
identifier: categoryId
aggregateRoot: true
summary: Represents a product category with hierarchical structure support.
properties:
  - name: categoryId
    type: UUID
    required: true
    description: Unique identifier for the category
  - name: name
    type: string
    required: true
    description: Name of the category
  - name: description
    type: string
    required: false
    description: Description of the category
  - name: slug
    type: string
    required: true
    description: URL-friendly identifier for the category
  - name: parentCategoryId
    type: UUID
    required: false
    description: Parent category for hierarchical structure
    references: Category
    referencesIdentifier: categoryId
    relationType: hasOne
  - name: childCategories
    type: array
    items:
      type: Category
    required: false
    description: Subcategories under this category
    references: Category
    referencesIdentifier: parentCategoryId
    relationType: hasMany
  - name: level
    type: integer
    required: true
    description: Depth level in the category hierarchy (0 = root)
  - name: isActive
    type: boolean
    required: true
    description: Whether the category is currently active
  - name: sortOrder
    type: integer
    required: false
    description: Display order within the same level
  - name: icon
    type: string
    required: false
    description: Icon URL or identifier for the category
  - name: imageUrl
    type: string
    required: false
    description: Category banner or thumbnail image
  - name: seoTitle
    type: string
    required: false
    description: SEO-optimized title for the category page
  - name: seoDescription
    type: string
    required: false
    description: SEO meta description for the category page
  - name: products
    type: array
    items:
      type: Product
    required: false
    description: Products belonging to this category
    references: Product
    referencesIdentifier: categoryId
    relationType: hasMany
  - name: createdAt
    type: DateTime
    required: true
    description: Date and time when the category was created
  - name: updatedAt
    type: DateTime
    required: false
    description: Date and time when the category was last updated
---

## Overview

The Category entity organizes products into a hierarchical structure, supporting multi-level categorization. It enables efficient product discovery and navigation through the e-commerce catalog.

### Entity Properties
<EntityPropertiesTable />

## Relationships

* **Parent Category:** Each category can have one parent `Category` (identified by `parentCategoryId`).
* **Child Categories:** A category can have multiple child `Category` entities creating a hierarchy.
* **Products:** A category contains multiple `Product` entities (identified by `categoryId`).

## Hierarchy Examples

```
Electronics (Level 0)
├── Computers (Level 1)
│   ├── Laptops (Level 2)
│   ├── Desktops (Level 2)
│   └── Tablets (Level 2)
├── Mobile Phones (Level 1)
│   ├── Smartphones (Level 2)
│   └── Feature Phones (Level 2)
└── Audio (Level 1)
    ├── Headphones (Level 2)
    └── Speakers (Level 2)
```

## Business Rules

* Root categories have `parentCategoryId` as null and `level` as 0
* Child categories must have a valid `parentCategoryId`
* Category slugs must be unique across the entire catalog
* Categories cannot be deleted if they contain products or subcategories
* Inactive categories should hide all associated products from public view
* Maximum hierarchy depth should be limited (e.g., 5 levels)